Riley Technologies

Riley Technologies LLC is an American motorsport engineering company and racing organization founded in 2001 by Bob Riley and his son Bill Riley. Both founders had previously been associated with Riley & Scott, a well-known constructor of sports-prototype and racing cars. Riley Technologies combines the activities of a constructor, engineering supplier, fabrication business, and competition team. Its work has included the design and manufacture of complete racing cars, prototype development for competition and industrial applications, preparation of customer vehicles, and operation of team entries in major North American endurance-racing championships. The company established its reputation through the Daytona Prototype category created for the Grand-Am Rolex Sports Car Series. Riley chassis became the most widely used and successful platform in the class, providing cars to multiple leading teams and winning the 24 Hours of Daytona with several different engine manufacturers. Riley-based Daytona Prototypes won the endurance classic in 2005, 2006, 2007, 2008, 2009, 2010, 2011, and again in 2015 after the creation of the United SportsCar Championship. These victories demonstrated the adaptability of the chassis to Pontiac, Lexus, Porsche, BMW, and Ford powertrains, while also making Riley a central supplier in the North American prototype ecosystem. Following the 2014 merger of the Grand-Am and American Le Mans Series structures into the United SportsCar Championship, Riley continued supplying Daytona Prototype machinery. The championship introduced technical changes intended to bring the former Daytona Prototypes closer to the performance of LMP2 cars. Riley products remained associated with teams including Chip Ganassi Racing, GAINSCO/Bob Stallings Racing, Michael Shank Racing, and Starworks Motorsport, although full-time use of Riley Daytona Prototype chassis declined as the regulations and field composition changed. Riley also expanded into GT racing. Its projects included the Mazda RX-8 chassis used by SpeedSource, the BMW M6 GT race car, a GT2 Chevrolet Corvette developed and raced in the American Le Mans Series, and the SRT Viper GTS-R and Viper GT3-R programs. The factory-supported Viper program achieved a strong 2014 season in the IMSA GTLM category, winning both the team and driver championships, with Kuno Wittmer taking the drivers' title. The Viper GT3-R was developed jointly with SRT Motorsports and Riley for customer competition in categories including IMSA GTD and the Pirelli World Challenge. In prototype racing, Riley partnered with Multimatic on the Riley-Multimatic MkXXX, a car developed for the 2017 LMP2 and DPi regulatory environment. The initial arrangement divided responsibilities between the two companies: Multimatic focused on the carbon-fiber tub, bodywork, and aerodynamic work, while Riley handled much of the mechanical design, manufacturing, and assembly. Multimatic later assumed the leading role in the LMP2 program, changing the original commercial and engineering balance of the partnership. Riley has also operated customer and associated entries in GT3, GT4, LMP3, and other endurance categories. The organization ran Mercedes-AMG GT3 cars in IMSA GTD competition from 2017, achieving a runner-up finish in the team championship in its first referenced season and later earning an Endurance Cup title. It subsequently competed with a Mercedes-AMG GT3 through the 2020 season and entered a Mercedes-AMG GT4 in the IMSA Michelin Pilot Challenge. In 2021, the associated program moved to the LMP3 class. For the 2025 IMSA SportsCar Championship, Riley expanded its visible competition role by fielding an Oreca 07 in LMP2 and serving as the operational provider for Lamborghini's Lamborghini SC63 GTP entry. The Lamborghini program transferred from Iron Lynx after disagreements between that team and Lamborghini. Riley ran the No. 63 car under the Automobili Lamborghini Squadra Corse banner, with Lamborghini factory drivers listed as Mirko Bortolotti, Romain Grosjean, Daniil Kvyat, and Edoardo Mortara. The company's identity therefore spans both behind-the-scenes engineering and direct participation in top-level endurance racing.

Riley Technologies was formed in 2001 by Bob Riley and Bill Riley, who brought experience from Riley & Scott into a new company focused on race-car construction and engineering. The company developed complete racing vehicles as well as specialized mechanical and prototype solutions for racing and manufacturing applications. Its early growth coincided with the expansion of the Daytona Prototype category in the Grand-Am Rolex Sports Car Series. Riley became the leading Daytona Prototype constructor by grid representation and race results. Its chassis were used by numerous teams and adapted to several engine packages. Riley-based cars won the 24 Hours of Daytona repeatedly, including victories in 2005 with SunTrust Racing, in 2006 through 2008 with Chip Ganassi Racing, in 2009 with Brumos Racing, in 2010 with Action Express Racing, in 2011 with Chip Ganassi Racing, and in 2015 after the formation of the United SportsCar Championship. The range of engine partners—Pontiac, Lexus, Porsche, BMW, and Ford—illustrated the platform's flexibility. In late 2006, Riley moved its headquarters to Mooresville, North Carolina. The location placed the company within a dense American motorsport cluster and supported its manufacturing and team activities. During the late 2000s, the company broadened its work beyond prototypes. It developed a Mazda RX-8 chassis for SpeedSource, unveiled a BMW M6 race car, and built and raced a GT2 Chevrolet Corvette in the American Le Mans Series. The Corvette achieved a notable qualifying result at Petit Le Mans in 2009 by leading both factory Corvette Racing cars. Riley was also involved in the SRT Viper racing program. The Viper GTS-R debuted in American Le Mans Series competition in 2012 and later appeared at the 24 Hours of Le Mans. In the 2014 IMSA season, the program won the GTLM team and driver championships, with Kuno Wittmer taking the drivers' title. The related Viper GT3-R extended the engineering effort into customer GT racing, including IMSA GTD and other international or regional series. The creation of the United SportsCar Championship in 2014 changed the prototype market. Riley remained a Daytona Prototype supplier and worked with teams including Chip Ganassi Racing, GAINSCO/Bob Stallings Racing, Michael Shank Racing, and Starworks Motorsport. Technical rules were revised to make the Daytona Prototype generation competitive with former American Le Mans Series LMP2 machinery, but the number of full-time Riley entries later decreased. For the 2017 prototype regulations, Riley entered a partnership with Multimatic. The resulting Riley-Multimatic MkXXX combined Multimatic's work on the carbon-fiber tub, bodywork, and aerodynamics with Riley's work on much of the mechanical design, component manufacture, and vehicle assembly. Multimatic subsequently announced that it would lead the LMP2 program, changing the originally intended division of commercial and engineering responsibilities. Riley continued to support GT and endurance programs. It fielded Mercedes-AMG GT3 customer cars in IMSA GTD from 2017 and achieved a second-place team-championship result in its first referenced season. The program continued with a single Mercedes-AMG GT3 in 2018, 2019, and 2020; the 2019 campaign included an Endurance Cup title. Riley also entered a Mercedes-AMG GT4 in the IMSA Michelin Pilot Challenge in 2019, winning the Daytona season opener with Jim Cox, Dylan Murry, and Jeroen Bleekemolen. The associated driver pairing later moved to the LMP3 class. Riley-linked engineering and team activities have appeared in additional categories, including the Continental Tire Sports Car Challenge, Super GT's GT300 class through a derivative of the Daytona Prototype known as the Mooncraft Shiden, and proposed track-day machinery. The track-day concept announced in 2008 was intended to use a mid-engine crate engine producing more than 500 horsepower while reducing the operating costs associated with conventional race cars. In 2025, Riley assumed a larger operational role in the IMSA SportsCar Championship. Alongside its No. 74 Oreca 07 LMP2 entry, it became the service provider for Lamborghini's No. 63 SC63 GTP car, taking over the program from Iron Lynx. The entry operated under Lamborghini's factory racing banner and used a group of Lamborghini factory drivers. This development underscored Riley's continuing shift between constructor, technical partner, and race-team roles.

• 2025

  Riley enters the GTP operating role for Lamborghini

  [1]Riley Technologiesen.wikipedia.org

  Riley operated Lamborghini's No. 63 SC63 in GTP while also fielding an Oreca 07 in LMP2.

• 2017

  Riley-Multimatic MkXXX program

  [1]Riley Technologiesen.wikipedia.org

  Riley and Multimatic developed the MkXXX for LMP2 and DPi competition.

• 2014

  United SportsCar Championship begins

  [1]Riley Technologiesen.wikipedia.org

  Riley continued as a Daytona Prototype supplier after the Grand-Am and American Le Mans Series structures were combined.

• 2006

  Headquarters relocate to Mooresville

  [1]Riley Technologiesen.wikipedia.org

  Riley moved its headquarters to Mooresville, North Carolina, in late 2006.

• 2005

  First referenced Riley Daytona Prototype Daytona victory

  [1]Riley Technologiesen.wikipedia.org

  A SunTrust Racing Pontiac-Riley won the 24 Hours of Daytona.

• 2001

  Riley Technologies is established

  [1]Riley Technologiesen.wikipedia.org

  Bob Riley and Bill Riley founded the company as a race-car constructor and engineering operation.

A specialist American constructor and motorsport engineering partner positioned around complete race-car development, low-volume competition manufacturing, customer support, and endurance-racing operations.

• Sports-prototype racing chassis

  Riley Daytona Prototype

  Riley's most successful early platform was a Daytona Prototype chassis developed for the Grand-Am Rolex Sports Car Series. The car became the category's dominant constructor by the number of entries and by race results. It was supplied to multiple leading teams and adapted to engines from Pontiac, Lexus, Porsche, BMW, and Ford. Riley Daytona Prototypes achieved repeated victories at the 24 Hours of Daytona and remained relevant after the creation of the United SportsCar Championship, when the cars were modified under revised technical rules.

• LMP2 and DPi prototype · 2017

  Riley-Multimatic MkXXX

  The MkXXX was developed jointly by Riley Technologies and Multimatic for the 2017 prototype regulations. Multimatic worked on the carbon-fiber tub, bodywork, and aerodynamic elements, while Riley was responsible for much of the mechanical design, component manufacture, and vehicle assembly. The program later moved under Multimatic's leading direction, changing the original division of responsibilities.

• GT racing car · 2012

  SRT Viper GTS-R

  Riley worked with SRT Motorsports on the Viper GTS-R program, which debuted in American Le Mans Series GT competition in 2012. The car later competed at the 24 Hours of Le Mans and in the IMSA GTLM category. In 2014, the program won the IMSA team and driver championships before the factory effort was discontinued by Chrysler after the season.

• GT3 customer racing car

  Viper GT3-R

  The Viper GT3-R was jointly developed by SRT Motorsports and Riley Technologies for customer-oriented GT competition. It competed in classes and series including IMSA GTD, Pirelli World Challenge GT, and the Dutch Supercar Challenge Super GT category.

• GTP hybrid sports prototype · 2025

  Lamborghini SC63 IMSA program

  Riley became the operational service provider for Lamborghini's No. 63 SC63 GTP entry in the 2025 IMSA SportsCar Championship. The car ran under the Automobili Lamborghini Squadra Corse banner, with Riley taking over the program from Iron Lynx. The role represents Riley's participation as a technical and team-operation partner rather than as the original vehicle marque.

• LMP2 racing car

  Oreca 07 LMP2 entry

  Riley fields an Oreca 07 in the LMP2 category of the IMSA SportsCar Championship. The entry illustrates the company's current role as a race-team operator and technical service provider using an externally manufactured prototype chassis.

• GT3 racing program · 2017

  Mercedes-AMG GT3 customer program

  Riley operated Mercedes-AMG GT3 customer cars in IMSA GTD competition from 2017 through the referenced 2020 campaign. The program included a 2017 runner-up result in the teams championship, a third-place overall finish in 2018, and an Endurance Cup title in 2019.

• 2025

  Expansion into Lamborghini's IMSA GTP operationStrategy

  Background

  Lamborghini changed the team operating arrangement for its SC63 IMSA program after disputes between Lamborghini and the previous operating team, Iron Lynx.

  Action taken

  Riley took over operational responsibility for the No. 63 Lamborghini SC63 while retaining an Oreca 07 LMP2 entry.

  Aftermath

  Riley's IMSA presence expanded from LMP2 participation to a two-category program including the top-level GTP class.

  Source

• 2017

  Restructuring of the Riley-Multimatic prototype partnershipStrategy

  Background

  Riley and Multimatic initially divided the MkXXX program between Riley-led commercial and mechanical responsibilities and Multimatic-led carbon-fiber and aerodynamic work.

  Action taken

  Multimatic announced that it would take the lead role in the LMP2 program, while Riley's originally planned leadership position was reduced.

  Aftermath

  The change made Multimatic the principal lead for the LMP2 effort and altered the structure under which the MkXXX had been introduced.

  Source

1. 1Riley Technologiesen.wikipedia.org
2. 2Riley Technologies official websiterileytech.com